oracle monitoring cannot be started

Oracle is a commonly used database management system, and Oracle monitoring is an important component for realizing communication between the client and the server. It plays a pivotal role in connecting to the database. Therefore, once the monitoring cannot be started, it will greatly affect the database. use and operation. Many times, various errors will occur when we start Oracle database monitoring. This article will describe the reasons and solutions for why Oracle database monitoring cannot be started.

1. The reason why Oracle monitoring cannot be started

1. The listening program port is occupied

Oracle monitoring communicates with the client through the listening program port , if the listening program port is occupied, the listening program cannot be started. At this point we need to check whether the port is occupied by other programs, and if so, the port needs to be released.

2. Oracle listening configuration file error

The Oracle listening configuration file is the listener.ora file. If the file is configured incorrectly, such as the listening program name, port number, and protocol If the configuration items are incorrect, the monitoring will not start properly.

3. Oracle database service is not started

If the Oracle database service is not started, client requests cannot be monitored. In Oracle, monitoring and database are interdependent. If one of them is abnormal, it will affect the normal operation of the other.

4. Errors in the Oracle listening program

During the startup process of the Oracle listening program, errors in the program itself may also occur, such as program files being damaged or missing, etc. This also This will cause the monitoring to fail to start normally.

The above are some common reasons and situations that cause Oracle monitoring to fail to start. Next, we will introduce the solutions.

2. Solution to Oracle monitoring failure to start

1. Check whether the listening program port is occupied

First, we need to confirm whether the listening program port is occupied If it is occupied by other programs, we can use the netstat command to check the port occupation. If the port is occupied, you can change to a free port to monitor, or stop the occupied program and release the port.

2. Check the Oracle listening configuration file

The listening configuration file is listener.ora. If the configuration file is incorrect, it needs to be checked and modified. We can edit the listener.ora file in the client's ORACLE_HOME/network/admin directory to check whether configuration items such as the listener program name, port number, protocol, etc. are correct, and modify and save them as needed.

3. Check whether the Oracle database service is started

When the Oracle database service is not started, the listener cannot listen to client requests. In Windows systems, we can check whether the Oracle service is started through the service manager (services.msc) and try to start it. If the service cannot start, you can check whether the Oracle database is installed correctly, or check the database log file for specific information.

4. Restart the Oracle listener

If none of the above methods solve the problem, we can try to restart the Oracle listener. In the CMD command line terminal, use the following command to restart the listening program:

lsnrctl stop

lsnrctl start

These two The two commands are used to stop and start the Oracle listener program respectively. After execution, we can view the log information through the listener program's log file (listener.log) to determine whether the problem has been solved.

In short, the failure of Oracle monitoring to start is a common problem, causing the database to fail to operate normally. However, through effective diagnostic methods and solutions, we can quickly solve such problems and make the Oracle database run normally again. In daily use and management, we need to always pay attention to the operation of the database and intervene in time to resolve abnormal situations.

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